3215111491 has 2 divisors, whose sum is σ = 3215111492. Its totient is φ = 3215111490.

The previous prime is 3215111483. The next prime is 3215111503. The reversal of 3215111491 is 1941115123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3215111491 - 2³ = 3215111483 is a prime.

It is not a weakly prime, because it can be changed into another prime (3215111441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1607555745 + 1607555746.

It is an arithmetic number, because the mean of its divisors is an integer number (1607555746).

Almost surely, 2^3215111491 is an apocalyptic number.

3215111491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3215111491 is an equidigital number, since it uses as much as digits as its factorization.

3215111491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 28.

The square root of 3215111491 is about 56701.9531497814. The cubic root of 3215111491 is about 1475.9285913400.

The spelling of 3215111491 in words is "three billion, two hundred fifteen million, one hundred eleven thousand, four hundred ninety-one".